So rape is not as bad as being horny or an 'idiot'. Ew.
The manga is about the uke being obsessed with his lil bro, that is how the story begins and why he is being manipulated by the rapist, the plot does not revolve about the rape, actually the mangaka uses the rape as something secondary, and that the uke is actually somehow accepting it because of how low the uke thinks of himself, so he thinks he deserves the rape for being a perverted older brother. Yeah the rapist is an asshole and I never defended him nor condone him, but it does not cancel the fact that the uke is a horny idiot.
Well this is not my favourite manga because the uke is a horny idiot, but I want to see what the lil bro is going to do now.Good cliffhanger.